I find I’m losing more hair then usual. I thought I was some season thing but I have never experienced this before. I examined some of my hair and found there to be white dots or bumps at the end of the hair where it attaches to the scalp. Also when I give me scalp a good scratch I get white stuff under my nails. It looks like powder almost but it rubs into skin and is somewhat oily. I have tried looking it up with no luck. What is this?